CVS log for loncom/auth/blockedaccess.pm

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- Bug 6955 IP-based blocking. Pass user'sIP address as third arg to
  loncommon::blockcheck() and second to loncommon::blocking_status().

- Bug 6518 Content blocking during quiz/exam.
  - For resources not in a course directly, but instead referenced by resources
    which are, symb to check to determine whether access should be blocked and
    why is symb of resource containing the dependency.
  - No $env{'request.enc'} in effect for dependent files.

- Bug 6518.
  More comprehensive access to symb for a requested URL to determine when
  access should be blocked and why, if content blocking in use.

- Bug 6518
  - Exam blocks can also block access to specified folders and/or resources
    for the duration of an exam.
  - Start time for blocking can be based on activation of the timer for
    a specific timed quiz item (map or resource-specific). End time for
    blocking is then start time plus the duration of the timed interval.

lonnet.pm:
  - &rolesinit() now returns an array containing references to hashes
    for the following: userroles, firstaccenv, timerintenv.
  - New db file: timerinterval.db contains interval which applied when
    user activated timer for a map or resource for which time limit applied.
    - needed to determine end time for exam blocks which are triggered by
      timer activation.
   - New routine &get_comm_blocks() used to get communication/collaboration
     blocks from a course.  Now cached for 10 minutes in memcached.
   - New routine: &has_comm_blocking() used to determine if exam block
     applies to display of requested content item in a course. Used by
     &allowed().
   - new routine: &check_docs_block() used by &has_comm_blocking().

loncommon.pm:
   - new items added to user's environment by &init_user_environment()
      - $env{'course.courseid.firstaccess.symb'} and
        $env{'course.courseid.timerinterval.symb'} where symb is the symb
        of the resource or map which provides the activation-based block
        for access to specific content.

blockedaccess.pm:
  - now called when access to content is blocked by an exam block.
    duration, and setter of block now available in pop-up from:
    &loncommon::blocking_status() for this type of access control.

Added missing CVS Ids for automatic version numbering to script header
(Irrespective if the script is still in use or not)

- style

Add response code of 'B' to lonnet::allowed() to indicate access to a file is currently subject to a block, because the file owner is part of a course with active communications blocking, and file viewer does not have 'evb' privilege in the course to nullify the block.

Used to block access to portfolio files.  Response of 'B' triggers blockedaccess.pm which displays information about blocking conditions.